Download 15 MC44BC375UA

Freescale Semiconductor, Inc.
Advance Information
MC44BC375UA/D
Rev. 1.8 08/2003
MC44BC375UA
MC44BC375UA
PLL Tuned VHF Audio/
Video High Integration
IC (Channel 3 and 4
80 dBµV RF Level)
QFN20 Package
Ordering Information
Device
Temp. Range
Package
MC44BC375UAD,R2
MC44BC375UAFC,R2
-20°C to +85°C
-20°C to +85°C
SO16NB
QFN20
NOTE: For tape and reel, add R2 suffix.
This modulator circuit is for use in VCRs, set top boxes, and similar devices.
1
2
3
4
5
6
7
Figure 1 shows the pin connections.
PSS
2
15
PLLFLT
LOP
XTAL
3
14
TVOVCC
4
13
TVOUT
GND
5
12
GND
PREEM
6
11
VCCA
AUDIO
7
10
SPLFLT
8
9
SO16NB pin package
CHS
SFS
17 16
15
TVOVCC
XTAL
2
14
TVOUT
GND
3
13
GND
NC
4
12
NC
5
11
NC
PREEM
VIDEO
PSave/LO
6
7
8
9
10
VCCA
SFS
18
VIDEO
16
19
PSave/LO
1
20
SPLFLT
CHS
1
PSS
NC
LOP
Features ..........................2
Pin Descriptions ............3
Device Overview ............5
Maximum Ratings ..........6
Thermal Rating ...............6
Electrostatic Discharge .6
Electrical
Characteristics
7
8 Pin Selection ..................8
9 High Frequency
Characteristics
8
10 Video Characteristics ....9
11 Audio Characteristics ....9
12 Characterization
Measurement
Conditions
9
13 Modulator
Functionality
14
14 Pin Circuit Schematics 16
15 MC44BC375UA
Application Schematic 17
16 Packaging
Instructions
18
17 Marking Instructions ...19
18 Case Outline and
Mechanical
Dimensions
20
PLLFLT
Contents List
AUDIO
Freescale Semiconductor, Inc...
SO16NB Package
QFN20 pin package
Figure 1. MC44BC375UA Pin Connection Diagram
This document contains information on a product under development. Freescale reserves the right to change or
discontinue this product without notice. © Freescale Semiconductor, Inc., 2003. All rights reserved.
For More Information On This Product,
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Features
Freescale Semiconductor, Inc.
1 Features
Channels are selectable using pin Channel Selection (CHS) and tuned by a PLL. They do not require any
external tank circuit components thus reducing the sensitivity of the PCB design and the need for external
adjustments. The PLL obtains its reference from a 4MHz crystal oscillator.
The sound subcarrier is also generated on-chip without external components. The 4.5MHz or 5.5MHz
Sound frequency is selectable via pin Sound Frequency Selection (SFS). The Picture to Sound subcarrier
ratio is also selectable by pin Picture to Sound selection (PSS) to either 14dB or 16dB. A Power Save
function is selectable via pin Psave/LO which turns off all internal VCOs and mixers and simultaneously
switches ON the Logic Output Port (LOP). No external Varicap Diodes/ Inductor nor other tuned
components are needed.
Freescale Semiconductor, Inc...
The MC44BC375UA also has the following features.
•
Channel selected by CHS pin
•
Integrated On-Chip Oscillator - No external tank circuit
•
Extremely Low External Components Count
•
Adjustable Video Modulation Depth (85% w/o adjustment)
•
Peak White Clip
•
Programmable Picture/Sound Carrier Ratio (14dB & 16dB) selected by PSS pin
•
Integrated On-chip Programmable Sound Subcarrier Oscillator (4.5 & 5.5MHz selected by SFS pin)
No external varicaps
•
Modulator Standby Mode selected by Psave/LO pin
•
Transient Output Inhibit During PLL Lock-up at Power-on
•
Logic Output Port selected by Psave/LO pin (Antenna Switch Driver)
•
Extremely Robust ESD protection, Minimum 4kV, typical) 6kV.
•
Available in 76 dBµV RF output level (MC44BC375U)
•
Available in SO16 NB package or QFN20 package (4 x 4 mm, 0.50 mm pitch)
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2 Pin Descriptions
2.1 SO16 Package Pin Description
Freescale Semiconductor, Inc...
SO16 Package Pin Descriptions
Pin number
Pin Name
Description
1
CHS
Channel select (channel 3 / channel 4)
2
PSS
PS select (PS=12 dB / PS=16dB)
3
LOP
Logical output port controlled by pin 9
4
XTAL
Crystal / oscillator input
5
GND
Ground
6
PREEMP
7
AUDIO
Audio input
8
SPLFLT
Sound PLL loop filter
9
PSAVE/LO
10
VIDEO
Video input
11
VCCA
Main analog supply voltage
12
GND
Analog ground
13
TVOUT
14
TVOVCC
TV output stage supply voltage
15
PLLFLT
RF PLL loop filter
16
SFS
Pre-emphasis capacitor
Power save mode or LO control
TV output signal
Sound carrier select (4.5 MHz / 5.5 MHz)
2.2 QFN20 Package Pin Description
Table 1. QFN20 Package Pin Descriptions
Pin number
Pin Name
Description
1
NC
2
XTAL
Crystal / oscillator input
3
GND
Ground
4
NC
5
PREEMP
6
AUDIO
Not connected
Not connected
Pre-emphasis capacitor
Audio input
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Pin Descriptions
Pin Descriptions
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
Table 1. QFN20 Package Pin Descriptions
Pin number
Pin Name
Description
7
SPLFLT
8
PSAVE/LO
9
VIDEO
Video input
10
VCCA
Main analog supply voltage
11
NC
Not connected
12
NC
Not connected
13
GND
Analog ground
14
TVOUT
15
TVOVCC
16
PLLFLT
17
SFS
Sound carrier select (4.5 MHz / 5.5 MHz)
18
CHS
Channel select (channel 3 / channel 4)
19
PSS
PS select (PS=12 dB / PS=16dB)
20
LOP
Logical output port controlled by pin 9
Sound PLL loop filter
Power save mode or LO control
TV output signal
TV output stage supply voltage
RF PLL loop filter
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Freescale Semiconductor, Inc.
Device Overview
3 Device Overview
Figure 2 shows a simplified block diagram of the MC44BC375UAdevice.
The MC44BC375UA device has two main sections:
1. A modulator section which accepts audio and video inputs and modulates the VHF carrier.
2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated
UHF oscillator, divided for VHF output)
The high frequency BICMOS technology permits integration of tank circuit and certain filtering functions.
VIDEO
LOP
10
Freescale Semiconductor, Inc...
3
Peak
White
TVOVCC
Video
Modulator
14
75Ω
TVOUT
8
MODULATOR
SECTION
Clamp
31.25kHz
Sound
Oscillator
and FM
Modulator
Sound
PFD
LPF
Snd Freq
Select
- SFS
Audio
Ampli
7
AUDIO
6
PREEM
13
Prog.
Divider
Power
save
Psave/
LOP
SPLLFLT
LPF
ALC
LPF
PSS
11
VCCA
5
GND
9
Sound
Modulator
SFS
Test Mode
Divider
16
Channel
Select CHS
1
PS1/2
Select
- PSS
2
VHF
Divider
UHF
OSC.
Prog.
Divider
Prescale
r/8
VCO & PLL
SECTION
PLL
Phase
Comp.
31.25kHz Ref Divider
/128
4Mhz
XCO
CHS
12
GND
15
PLLFLT
Figure 2. MC44BC375UA Block Diagram
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4
XTAL
Maximum Ratings
Freescale Semiconductor, Inc.
4 Maximum Ratings
Sym
Vcc
Parameter
Value Unit
Supply voltage
6
Tamin
Minimum operating ambient temperature
–20
Tamax
Maximum operating ambient temperature
85
V
fields. However, precautions must be taken to avoid
oC
applications of any voltage higher than maximum rated
C
–65
o
Tstgmax Maximum storage temperature
150
o
150
°C
Junction Temperature
against damage due to high static voltage or electric
o
Tstgmin Minimum storage temperature
Tj
This device contains protection circuitry to guard
C
C
voltages to this high impedance circuit. For proper
operation, input and output voltages should be
constrained to the ranges indicated in the
Recommended Operating Conditions.
Freescale Semiconductor, Inc...
Maximum ratings are those values beyond which damage to the device may occur. For functional operation, values
should be restricted to the Recommended Operating Condition.
Meets Moisture Sensitivity Level 1, no dry pack required
5 Thermal Rating
Sym
Rthja
Parameter
Value
Unit
Thermal resistance from Junction to Ambient
105
°C/W
Thermal resistance from Junction to Ambient
140
°C/W
Min
Typ
6 Electrostatic Discharge
Electrostatic Discharge (ESD) tests are done on all pins.
Sym
Parameter
Unit
ESD
MM (Machine Model) - MIL STD 883C method 3015-7
200
500
V
ESD
HBM (Human Body Model) - MIL STD 883C method 3015-7
4000
6000
V
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Electrical Characteristics
7 Electrical Characteristics
•
A: = 100% Tested
•
B: = 100% Correlation tested
•
C: = Characterized on samples
•
D: = Design parameter.
7.1 Specification Conditions:
Unless otherwise stated: Vcc = 5.0V, T amb. = 25°C.Video input 1Vp-p, 10 step greyscale. RF inputs /
outputs into 75Ω load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION
Freescale Semiconductor, Inc...
Power Supply Parameters
Min
Typ
Max
Operating Supply Voltage range
4.5
5.0
5.5
V
Total Supply Current
40
50
57
mA
All sections active
A
Total Standby Mode Supply Current
3
6
8
mA
PSave/LO=LO
A
DC Parameter
Unit
Min
Threshold voltage level on pins CHS, PSS, SFS, PSave/LO
Notes
Type
B
Typ
Max
Unit
Type
V
C
Sound Comparator Charge Pump Current: During locking
When locked
7
2.1
10
12
µA
A
0.7
1
1.5
µA
A
RF Comparator Charge Pump Current
60
100
150
µA
A
Crystal Oscillator Stability - negative resistance
1
-
-
KΩ
D
Logic Output Port: Saturation voltage @ I=15mA
Leakage current
-
210
-
300
1
mV
uA
A
A
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Pin Selection
8 Pin Selection
Pin Nb
Pin Name
LO (grounded)
HI (Open or +5V)
1
CHS
CH4
CH3
2
PSS
14dB
16dB
9
PSave/LO
Power save Mode
LOP pin LO (Low voltage)
Normal Operation
LOP pin HI (High impedance
16
SFS
5.5Mhz
4.5Mhz
By default (open condition), all pins are “HI”.
Freescale Semiconductor, Inc...
8.1 Test Modes
Pin
DC level
Description
CHS
Vcc + 0.3V
Vcc + 1.1V
Low frequency testing (RF frequency divided by)
Base band test mode (DC drive applied to modulators)
PSS
Vcc + 1Vbe
Transient Output Inhibit Disabled
SFS
Vcc + 1Vbe
Sound Oscillator OFF
VIDEO
Vcc + 0.3V
Vcc + 1.1V
Force UHF and Sound PLL Upper current source
Force UHF and Sound PLL Lower current source
NOTE:
Test modes are intended for manufacturing test purpose only and not to be
be used for normal application.
9 High Frequency Characteristics
For all the following specifications and unless otherwise stated: Vcc = 5.0V, T amb. = 25°C.Video input
1Vp-p, 10 step greyscale.RF inputs/outputs into 75Ω load.SPECIFICATIONS ONLY VALID FOR
ENVELOPE DEMODULATION. Measured on both channel 3 and 4. See Section 12, “Characterization
Measurement Conditions” on page 9.
Parameter
Test Conditions
TV OUT output level
Min
Typ
Max
Unit
Type
78
80
83
dBuV
B
Sound subcarrier Harmonics (fp+n*fs)
Ref Picture carrier
-
-72
-65
dBc
C
Second Harmonic of chroma subcarrier.
Using red EBU bar
-
-
-60
dBc
C
Chroma/Sound intermodulation: fp + (fsndUsing red EBU bar
fchr)
-
-
-60
dBc
C
Fo (picture carrier) Harmonics
2nd harmonic
3rd harmonic
46
73
dBµV
dBµV
C
C
Out Band (picture carrier) Spurious
1/2*Fo - 1/4*Fo - 3/2*Fo - 3/4*Fo
32
dBµV
C
In band spurious (Fo +/- 5 MHz range)
No video or sound modulation
-60
dBc
C
4 MHz Crystal Spurious (Fo +/- 4 MHz)
No video or sound modulation
-75
dBc
C
Note:
1: Picture carrier harmonics are highly dependant on PCB layout and decoupling capacitors.
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Video Characteristics
10 Video Characteristics
Freescale Semiconductor, Inc...
Parameter
Test Conditions
Min
Typ
Video bandwidth
Reference 0dB at 100kHz, measured at 5MHz
-1.5
-0.5
Video input level
75Ohm load
—
—
Max
Unit
Type
—
dB
C
1.5
Vcvbs
D
Video input current
—
0.2
1
µA
A
Video input impedance
—
500
—
KΩ
A
49
56
52
60
dB
dB
C
C
+/-5
deg
C
Video S/N
Unweighted
Weighted
Differential Phase
On line 17 in M standard (FCC)
Differential Gain
On line 17 in M standard (FCC)
Luma/Sync ratio
Input ratio 7.0:3.0
Video modulation depth
Video input level=1.0 Vcbvs
Peak White Clip
Video Modulation Depth for Video=1.4 Vcbvs
+/-1.5
1
5
%
C
6.8/
3.2
—
7.2/
2.8
—
B
80
85
90
%
B
90.5
95
99.5
%
B
11 Audio Characteristics
All audio measurement use specified pre-emphasis circuit.
Parameter
Picture to Sound ratio
Test Conditions
PSS (Pin2) = HI
PSS (Pin2) =LO
Picture to Sound ratio difference between PSS = HI and PSS = LO
Min
Typ
Max Unit Type
14
12
16
14
18
16
dB
dB
B
1.5
2.0
2.5
dB
B
Using specific pre-emphasis circuit - Audio Input: 1Khz @ 205 mVrms
Audio FM Modulation Depth
Fs = 4.5 MHz
(100% Modulation = +/- 25 kHz FM Deviation)
75
85
95
%
B
Fs = 5.5 MHz
(100% Modulation = +/- 50 kHz FM Deviation)
75
85
95
%
B
45
55
61
kΩ
A
-2.5
-
+2
dB
C
-
0.3
1
%
C
50
53
-
dB
C
Audio input resistance
Audio Frequency response
0dB ref @1kHz
Measure from 50Hz to 15kHz
Audio Distortion FM (THD only)
At 1 kHz and 100% mod (+/- 50 kHz) - No Video
Audio S/N with Sync Buzz FM
12 Characterization Measurement Conditions
Device default configuration unless otherwise specified:
•
Sound subcarrier frequency = 5.5Mhz
•
Picture-to-sound carrier ratio = 12dB
•
CH3 & CH4 frequencies
RF Inputs / Output into 75ohm Load using a 75 to 50 ohm transformation.Video Input 1V pk-pk.Audio
pre-emphasis circuit engaged.
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Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
TVOUT output level
Measured picture carrier in dBuV with the HP8596E Spectrum Analyzer
using a 75 to 50 ohm transformation, all cables losses and transformation
pads having been calibrated.
Measurement used as a reference for other tests: TVout_Ref
Video: 10 steps grey scale
No audio
Sound Subcarrier Harmonics
Measure in dBc second and third sound harmonics levels in reference to
picture carrier (TVout_Ref).
Picture carrier
Sound carrier
Freescale Semiconductor, Inc...
Video: 10 steps grey scale
No Audio signal
Sound
2nd harm
Sound
3rd harm
Fo
+5.5Mhz
+11Mhz +16.5Mhz
Second Harmonics of Chroma subcarrier
No audio
Video: a 700mVpk-pk 100Khz sinusoidal
signal is inserted on the black level of
active video area.
Measure in dBc, in reference to picture carrier (TVout_Ref), second
harmonic of chroma at channel frequency plus 2 times chroma
frequency, resulting in the following spectrum
Picture carrier
Chroma
carrier
Frequency
Frequency
100kHz
100Khz
Sound
carrier
Chroma 2nd
Harmonic
700mVpkpk
700mV pk-pk
Fo
+4.43Mhz +5.5Mhz
+8.86Mhz
Chroma/Sound intermodulation
No audio signal
Video: 700mVpk-pk 100Khz sinusoidal
signal inserted on the black level of
active video area.This is generated using
a Rohde & Schwarz Video Generator
SAF and inserting the required frequency
from a RF Signal generator.
Frequency
Frequency
100kHz
4.43Mhz
Measure in dBc, in reference to picture carrier (TVout_Ref),
intermodulation product at channel frequency plus the sound carrier
frequency (+5,5Mhz) minus the chroma frequency (-4,43Mhz), resulting
in the following spectrum.
Intermodulation product is at the channel frequency +1,07Mhz.
Picture carrier
Chroma
carrier
Sound
carrier
Chroma/Sound
Intermod.
700mVpkpk
700mV pk-pk
Fo
+1.07Mhz
+4.43Mhz +5.5Mhz
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Inc.
Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
Picture Carrier Harmonics
Measure in dBc, in reference to picture carrier (TVout_Ref), second and
third harmonic of channel frequency, resulting in the following spectrum.
Picture carrier
No Video signal
No Audio signal
3rd harmonic
2nd harmonic
Fo
2Fo
3Fo
Freescale Semiconductor, Inc...
Out of Band Spurious
Measure in dBuV spurious levels at 0.25, 0.5, 0.75 and 1.5 times channel
frequency, resulting in the following spectrum
Measure from 40Mhz to 1Ghz.
Picture carrier
No Video signal
No Audio signal
Spurious
Fo/4
Fo/2 Fo*3/4
Fo
Fo*3/2
In Band Spurious / 4Mhz Crystal Spurious
Measure in dBc, in reference to picture carrier (TVout_Ref), spurious
levels falling into video bandwidth Fo+/-5Mhz (15.125Khz & 31.25Khz
from reference dividers and 4Mhz from crystal).
No Video signal
No Audio signal
Video Bandwidth
No audio
Video: 600mVpk-pk sinusoidal signal
inserted on the black level of active video
area.
The Video signal is demodulated on the spectrum analyzer, and the peak
level of the 100Khz signal is measured as a reference. The frequency is
then swept from 100Khz to 5Mhz, and then the difference in dBc from the
100Khz reference level is measured.
Weighted Video Signal to Noise
Video: 100% White video signal - 1Vpkpk.
No Audio signal
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with
sound trap and envelope detection, and
a Rohde & Schwarz UAF Video
Analyzer.
The Video Analyzer measures the ratio between the amplitude of the
active area of the video signal (700mV) and the noise level in Vrms on a
video black level which is show below.
VideoS/N is calculated as 20 x log(700 /N) in dB
N
noise level in Vrms
Unweighted Video Signal to Noise
Same as above with CCIR filter disabled. Same as above.
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Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
Video Differential Phase
Video: 5 step Grey Scale- 1Vpk-pk.
No Audio signal
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with
sound trap, and envelope detection, and
a Rohde & Schwarz UAF Video
Analyzer.
On line CCIR 330, the video analyzer DP measure consists of calculating
the difference of the Chroma phase at the black level and the different
chroma subcarrier phase angles at each step of the greyscale. The
largest positive or negative difference indicates the distortion.
the largest positive or negative difference
DIFF PHASE =
* 100%
the phase at position 0
The video analyzer method takes the worst step from the first 4 steps.
Freescale Semiconductor, Inc...
Video Differential Gain
On line CCIR 330 shown below, the video analyzer DG measure consists
of calculating the difference of the Chroma amplitude at the black level
and the different amplitudes at each step of the greyscale. The largest
positive or negative difference indicates the distortion.
Video: 5 step Grey Scale- 1Vpk-pk.
No Audio signal
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with
sound trap and envelope detection, and
a Rohde & Schwarz UAF Video
Analyzer.
0
1
2
3
4
5
5-step Greyscale with Chroma subcarrier superimposed
(not to scale), line CCIR 330.
the largest positive or negative difference
DIFF GAIN =
the amplitude at position 0
* 100%
The video analyzer method takes the worst step from the first 4 steps.
CCIR line 330 corresponds to FCC line 17 in NTSC/M standard
Video Modulation Depth
This is measured using a HP8596E Spectrum Analyzer with a TV Trigger
option, allowing demodulation and triggering on any specified TV Line.
The analyzer is centred on the maximum peak of the Video signal and
reduced to zero Hertz span in Linear mode to demodulate the Video
carrier.
A(mV)
A ( 6-10mV)
No Audio signal
Video: 10 step grey scale
B(mV)
B (0.6 - 3mV)
TV Line Demodulated by Spectrum Analyzer-BG standard
The Modulation Depth is calculated as (A-B)/A x 100 in%
Picture to Sound ratio
Measure in dBc sound carrier in reference to picture carrier (TVout_Ref)
for “PS” bit=0 (PS=12dB typical) and for “PS” bit=1 (PS=16dB),
Picture carrier
No Video signal
No Audio Signal
“PS” bit set to 0 and 1
Sound carrier
Fo
+5.5Mhz
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Inc.
Characterization Measurement Conditions
Device and Signals Set-up
Measurement Set-up
Audio Modulation Depth - FM Modulation
Video Black Level
Audio signal: 1Khz, 205mVrms.
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A Audio Analyzer at 1kHz
The audio signal 205mV at 1kHz is supplied by the Audio Analyzer, and
the FM demodulated signal deviation is indicated on the Demodulator in
Khz peak.
This value is then converted in% of FM deviation, based on specified
standards.
Freescale Semiconductor, Inc...
Audio Frequency response
The audio signal 1KHz 100mVrms is supplied by the Audio Analyzer,
demodulated by the Demodulator and the audio analyzer measures the
Video Black Level
AC amplitude of this demodulated audio signal: this value is taken as a
Audio signal: 50Hz to 15KHz, 100mVrms
reference (0dB).
This is measured using a Rohde &
The audio signal is then swept from 50Hz to 15KHz, and demodulated
Schwarz AMFS Demodulator in B/G and
AC amplitude is measured in dB relative to the 1KHz reference.
a HP8903A.
Audio pre-emphasis and de-emphasis circuits are engaged, all audio
analyzer filters are switched OFF.
Audio Distortion FM
Audio: 1Khz, adjustable level
Video Black Level
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
and a HP8903A Audio Analyzer at 1kHz.
The output level of the Audio analyzer is
varied to obtain a deviation of 50kHz
indicated on the Demodulator.
The input rms detector of the Audio Analyzer converts the ac level of the
combined signal + noise + distortion to dc. It then removes the
fundamental signal (1kHz) after having measured the frequency. The
output rms detector converts the residual noise + distortion to dc. The dc
voltmeter measures both dc signals and calculates the ratio in% of the
two signals.
ADist = ( Distorsion + Noise ) ⁄ ( Distorsion + Noise + Signal )
Audio Signal to Noise
The Audio Analyzer alternately turns ON and OFF it's internal audio
source to make a measure of the Audio signal plus noise and then
another measure of only the noise.
Audio: 1Khz, adjustable level
The measurement is made using the internal CCIR468-2 Filter of the
Video: EBU Color Bars
Audio Analyzer together with the internal 30+/-2kHz (60dB/decade)
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and Lowpass filters.
a HP8903A Audio Analyzer at 1kHz. The The AMFS demodulator uses a quasi-parallel demodulation as is the
case in a normal TV set. In this mode the Nyquist filter is bypassed and
output level of the Audio analyzer is
the video carrier is used without added delay to effectuate intercarrier
varied to obtain a Modulation Deviation
conversion. In this mode the phase noise information fully cancels out
of 25kHz indicated on the AMFS
and the true S/N can be measured
Demodulator.
ASN ( dB ) = 20 × log ( Signal + Noise ) ⁄ ( Noise )
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Modulator Functionality
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13 Modulator Functionality
13.1 Power Supply
The two device Vccs (pins 11 and 14) must be applied at the same time to ensure all internal blocks are
correctly biased. Do NOT bias any other pin before Vcc is applied to device.
13.2 Test Modes
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The MC44BC375UA test modes are enabled by any voltage level higher than Vcc on pins CHS, PSS, SFS
and VIDEO. Care must be taken in the application to not reach levels higher than Vcc on those pins.
13.3 Standby Modes
During standby mode, the modulator is switched to low power consumption: the sound oscillator, UHF
oscillator and VHF dividers, video and sound modulator sections bias are internally turned OFF.
Modulator is programmed in standby mode when pin 9 PSave/LO is set to “LO” level (See PIN
SELECTION section).
13.4 Logic Output Port
The Logic Output Port is used to control an external switch (such as an antenna switch or an attenuator).
This pin is an open collector transistor able to drive up to 15mA at low voltage.
LOP level is switched between “HI” and “LO” level with pin 9 “Psave/LO” (See PIN SELECTION
section).
13.5 Transient Output Inhibit
To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the
desired frequency, the Sound and Video modulators are turned OFF at power-ON from zero (i.e. Vcc is
switched from 0V to 5V or device is switched from “Standby mode” to “Normal operation”).
There is a time-out of 263ms until the output is enabled. This lets the UHF PLL settle to its programmed
frequency. During the 263ms time-out, the sound PLL current source is set to 10µA typical to speed up the
locking time; after the 263ms time-out, the current source is switched to 1 µA. Use care when selecting
loop filter components, to ensure the loop transient does not exceed this delay.
For test purposes, it is possible to disable the 263ms delay (see TEST MODES section).
13.6 Video Section
The modulator requires a composite video input with negative going sync pulses and a nominal level of
1Vp-p. This signal is AC coupled to the video input where the sync tip level is clamped.
Video modulation depth typical value is given for 1VCBVS input level. It can be adjusted to any lower
value by simply adding a resistive divider at video input, resulting in a lower signal seen by the video input
stage.
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Freescale Semiconductor, Inc.Modulator Functionality
The video signal is then passed to a peak white clip circuit whose function is to soft clip the top of the
video waveform if the amplitude from the sync tip to peak white goes too high. In this way overmodulation of the carrier by the video is avoided. The clipping function is always engaged.
13.7 Sound Section
The multivibrator oscillator is fully integrated and does not require any external component. An internal
low pass filter and matched structure give very low harmonics level.
The sound modulator system consists of an FM modulator incorporating the sound subcarrier oscillator.
The audio input signal is AC coupled into the amplifier which then drives the modulator.
Freescale Semiconductor, Inc...
The audio pre-emphasis circuit is a high-pass filter with an external capacitor C1 and an internal resistor
(100kOhms typical). The recommended capacitor value (750pF) is for M/N standards; time constant is
75µs. It is 470pF for B/G standards (50µs).
Audio bandwidth specification is for 50Hz to 15Khz range, with pre-emphasis circuit engaged. Without
this pre-emphasis circuit, it is possible to extend the audio bandwidth to the high frequencies as there is no
internal frequency limitation (stereo application).
13.8 PLL Section — Dividers
The reference divider is a fixed divide by 128 resulting in a reference frequency of 31.25Khz with a
4.0Mhz crystal. The 31.25Khz reference frequency is used for both UHF and Sound PLLs.
The prescaler is a fixed divide by 8 and is permanently engaged. The VHF divider is also a fixed divide by
8.
The programmable divider’s division ratio is controlled by CHS pin voltage in order to get the channel 3 or
channel 4.
13.9 Selectable Pins
Pins CHS, PSS, SFS are internally pulled up to 5V.
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Freescale Semiconductor, Inc.
Pin Circuit Schematics
14 Pin Circuit Schematics
VCC
100K
CHS
PSS
SFS
Psave
VCC
VCC
LOP
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5K
XTAL
1.5K
VCC
VCC
50k
PREM
10k
11.8k
audio
VCC
AUDIO IN
VCC
TV OUT
VCC
5K
VCC
SPLLFLT
75
TVOVCC
VCC
VCC
VCC
100
PLLFLT
2K
500
10K
10K
Figure 3. Pin Schematics
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VIDEO
Freescale Semiconductor,
Inc.
MC44BC375UA Application Schematic
15 MC44BC375UA Application Schematic
This document contains information
on a new product under development
Freescale reserves the right to change
or discontinue this product without notice
CH 3/4
Select
O
PS1/2
Select
O
SFS
Select
O
Loop Filter must
be as close as
47nF
LOP
2
15
3
14
4
13
5
12
6
11
Cx***
4MHz
Pre-em
C1
330nF
100nF
7
10
8
9
10nF
2.2k
Vcc
O
16
1nF
O TVOUT
O
1
O
10nF
Vcc
1nF 220nF
75*
10k
Psave/LO
O
Audio
O
R2**
R1**
22nF
O
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22nF
Video
*: This 75Ω is to match with a 75Ω video signal applied thru coaxial cable.
It can be removed in case of high impedance video generator.
R1 and R2 are to reduce video modulation depth from typical value
(for example R1=1KΩ and R2=10KΩ reduce VMD by about 8%)
Cx is dependant on the crystal characteristics (Cx=27pF on Freescale application Board)
C1 value depends on standard: 470pF is for 50µs pre-emphasis time constant (B/G standard)
and 750pF is for 75µs (M/N standard).
Figure 4. MC44BC375UA Application Schematic
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Packaging Instructions
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16 Packaging Instructions
Tape and reel packaging per 12MRH00360A issue Y with the following conditions applicable for Dual InLine SOP (SOIC) package and Quad Flat Pack No Lead Square (QFN).
Freescale Semiconductor, Inc...
Figure 5. Dual In-line SOP (SOIC)
Component Orientation: Arrange parts with the pin 1 side closest to the tape's round sprocket holes on the
tape's trailing edge.
Figure 6. Quad Flat Pack No Lead Square
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Marking Instructions
17 Marking Instructions
The following instructions are in accordance with the 12MRH00191A specification.
17.0.1 SO16NB Package
.
Bar marked part way across Pin 1 end of package.
Bar width 10 to 20 mils, length to be at least four
times Bar width. Bar placement may extend across
chamfer and dimple areas.
M44BC375UA
Freescale Semiconductor, Inc...
Pin 1 Dot or Dimple
•
1st line:
M44BC375UA
Part number coded on 10 digits maximum
•
2nd line:
Assembly site code AW (2 digits) followed by the
wafer lot code L (1 digit),
year Y (1 digit) and
17.0.2 QFN20 Package
(M)
P75UA
•
1st line: P75UA
(Part number coded on 4 digits)
•
2nd line: ALYW
(Assembly site code A (1 digit)
wafer lot code L (1 digit),
year Y (1 digit) and
work week W (1 digit)
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AWLYWW
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Case Outline and Mechanical Dimensions
18 Case Outline and Mechanical Dimensions
Freescale Semiconductor, Inc...
18.1 SO16 NB package
Millimeters
Inches
Dim
Min
Max
Min
Max
A
1.35
1.75
0.054
0.068
A1
0.1
0.25
0.004
0.009
D
9.8
10
0.385
0.393
E
5.8
6.2
0.229
0.244
E1
3.8
4
0.150
0.157
b
0.35
0.49
0.014
0.019
c
0.19
0.25
0.008
0.009
e
1.27 BSC
0.050 BSC
L
0.4
1.25
0.016
0.049
h
0.25
0.5
0.010
0.019
Q
0o
7o
0o
7o
Note: 1. Dimensions and Tolerances per ASME
Y14.5M, 1994.
Note:
2. Controlling dimension: Millimeters.
Note: 3. Dimension D and E1 do not include mold
protrusion.
Note:
side.
4. Maximum mold protrusion 0.15 (0.006) per
Note: 5. Dimension b does not include Dambar
protrusion.
Allowable Dambar protrusion shall be 0.127 (0.005)
total in excess of the b dimension at maximum material
condition.
Figure 7. SO16NB Package
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Case OutlineInc.
and Mechanical Dimensions
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18.2 QFN20 (4 x 4mm, 0.50 mm pitch)
Figure 8. QFN20 Package (1 of 4)
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Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
Case Outline and Mechanical Dimensions
Figure 9. QFN20 Package (2 of 4)
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Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
Case Outline and Mechanical Dimensions
Figure 10. QFN20 Package (3 of 4)
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Semiconductor, Inc.
Freescale Semiconductor, Inc...
Freescale
Case Outline and Mechanical
Dimensions
Figure 11. QFN20 Package (4 of 4)
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Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
NOTES
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